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J/AJ/127/646       Unbiased census of AGN in 2MASS           (Francis+, 2004)
An unbiased census of active galactic nuclei in the Two Micron All Sky Survey.
    Francis P.J., Nelson B.O., Cutri R.M.
   <Astron. J., 127, 646-655 (2004)>
   =2004AJ....127..646F
ADC_Keywords: Active gal. nuclei ; QSOs ; Surveys ; Redshifts ;
              Equivalent widths
Keywords: galaxies: active - quasars: general - surveys


Abstract:
    We present an unbiased near-IR-selected AGN sample, covering
    12.56deg2 down to Ks∼15.5, selected from the Two Micron All Sky
    Survey (2MASS). Our only selection effect is a moderate color cut
    (J-Ks>1.2) designed to reduce contamination from Galactic stars. We
    observed both pointlike and extended sources.

Description:
    We observed spectra of sources in four fields on the nights of 2002
    March 5-7. Each field was circular and 1° in radius. The fields
    were centered at 09:44+00:00, 12:44+00:00, 13:00-25:00, and
    14:15-26:00 (J2000.0).

    Observations were carried out with the Two Degree Field (2dF)
    spectrograph on the Anglo-Australian Telescope.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table5.dat        74      968   All Galaxies with Secure Redshifts


See also:
    II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       2MASS hour of right ascension (J2000)
   4-  5  I2    min     RAm       2MASS minute of right ascension (J2000)
   7- 11  F5.2  s       RAs       2MASS second of right ascension (J2000)
      13  A1    ---     DE-       Sign of the 2MASS declination (J2000)
  14- 15  I2    deg     DEd       2MASS degree of declination (J2000)
  17- 18  I2    arcmin  DEm       2MASS arcminute of declination (J2000)
  20- 23  F4.1  arcsec  DEs       2MASS arcsecond of declination (J2000)
  25- 30  F6.4  ---     z         Redshift
      32  A1    ---     q_z       Quality flag on z (1)
  34- 37  A4    ---     Class     Spectral classification (2)
  39- 42  F4.1  mag     Ksmag     The 2MASS Ks band magnitude
  44- 47  F4.2  mag     J-K       The 2MASS (J-Ks) color
  49- 53  F5.1  nm      Ha        ? Rest-frame Hα equivalent width (3)
  55- 58  F4.1  nm      Hb        ? Rest-frame Hβ equivalent width (3)
  60- 64  F5.1  nm      [OIII]    ? Rest-frame [OIII] equivalent width (3)
  66- 69  F4.1  nm      NII       ? Rest-frame NII equivalent width (3)
  71- 74  F4.1  nm      SII       ? Rest-frame SII equivalent width (3)

Note (1): Values of 4 or higher are considered reliable.
    Only galaxies with reliable redshifts are shown.
Note (2): Spectral classification:
    gal = Galaxy without noticable emission lines.
    sb  = Galaxy with emission-line ratios typical of a starburst. A question
           mark indicates a classification based on lines near Hα only.
    sy1 = Galaxy with broad (>1000km/s FHWM) emission lines.
    sy2 = Galaxy with narrow emission lines, with ratios typical of an AGN.
           A question mark indicates a classification based on lines near
           Hα only.
    gem = Galaxy with narrow emission lines that could not be classified
           as a starburst or AGN.
Note (3): Wavelength regions used in emission-line measurements:
     ----------------------------------------------------------------
      Line     Continuum Integration Limits   Line Integration Limits
                           (nm)                    (nm)
     ----------------------------------------------------------------
     Hβ     474.0-484.0, 488.0-494.0       484.5-488.0
     [OIII]      488.0-494.0, 503.0-510.0       499.0-502.5
     Hα    640.0-652.0, 663.0-670.0       655.0-657.2
     NII         640.0-652.0, 663.0-670.0       657.2-659.4
     [SII]       663.0-670.0, 674.5-684.5       670.0-674.5
     ----------------------------------------------------------------


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    02-Jul-2004